Multi purpose device for the texturizing of textile threads by false twist

ABSTRACT

A multi-purpose device for texturing textile threads by application of false twist comprising a false twist tube having a cross-pin for engagement with a thread passing therethrough, a pair of rotatable cylinders having frictional inner surfaces for engagement with a thread passing therethrough, means mounting the false twist tube for rotation in tangential contact with the pair of rotatable cylinders, and thread guide means positioned upstream and downstream of the cylinders and tube for directing the thread in selected paths to and from the false twist tube and cylinders.

O United States Patent 11 1 1111 3,

Neveux June 26, 1973 MULTl-PURPOSE DEVICE FOR THE 3,537,250 11/1970Mackintosh 57/77.4 TEXTURIZING 0 TEXTILE THREADS BY 3,695,020 10/1972Richter 57/77.4 FALSE TWIST FOREIGN PATENTS OR APPLICATIONS [75]Inventor; Jacques Neveux Riorges France 850,079 9/1960 Great Britain57/77.4

[73] Assignee: Moulinage Et Retorderie De Primary Examiner DonaldWatkins I Chavanoz Chavanoz, France Attorney-Norman C. Armitage, Luke.I. Wilburn, .I r. [22] Filed: Oct. 8, 1971 et al.

A l. N 1 pp 0 87,798 7 ABSTRACT A multi-purpose device for texturingtextile threads by [30] Fore'gn Application Data application of falsetwist comprising a false twist tube Oct. 12, 1970 France 7037046 havinga c ogs-pin for engagement with a thread passing therethrough, a pair ofrotatable cylinders having [52] US. Cl. 57/77.45 f i ti l i ner urfacesfor engagement with a thread Illt- 8 U 8 g passing therethrough, meansmounting the false twist Field of Search 77-45, 34 R tube for rotationin tangential contact with the pair of rotatable cylinders, and threadguide means positioned References Cited upstream and downstream of thecylinders and tube for UNITED STATES PATENTS directing the thread inselected paths to and from the 3,066,473 12/1962 Maeda 57 77.4 falsetwist tube and cylinders- 9 Claims, 7 Drawing Figures PAIENIEUJUIIZG B73smears nlvmon JACQUIS nmrx PATENTEUJUIIZS ms FIG.6

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MULTI-PURPOSE DEVICE FOR THE TEXTURIZING E TEXTILE THREADS BY FALSETWIST The present invention concerns a new multi-purpose device for thetexturing of textile threads by false twist. Until now the texturizingof a thread by false twist was done either by means of devicescomprising a false twist tube, or spindle, in which the thread passesand which, by rotation, gives the thread a temporary overtwist which isset thermally, or by means of devices which give the thread a temporaryover-twist by friction of the thread against a surface, also setthermally.

Many devices for the execution of the forementioned processes are known.Thus French Pat. No. 1,239,013, and its addition 80,499, describe aclassical false twist spindle in which the false twist spindle is drivenin rotation by tangential contact with cylinders with parallel axes, atleast one of the cylinders being driven in rotation, the spindle beingpressed against the cylinders by a magnet.

Also, French Pat. 1,284,485 and Italian Pat. 698,343 describe devicesfor false twist by friction formed of two hollow cylindrical elements,with parallel axes and turning in opposite directions, the threadpassing inside these cylinders and rubbing against the edges of thecylinders which are formed of a material with a high coefficient offriction.

Now, and this is the object of the present invention, a new device hasbeen found which allows to perform either classical false twist or falsetwist by friction, by simple modification of the path of the thread insaid device. Such a device is therefore very advantageous by the fact ofits multi-purpose which allows, according to market requirements and thenature of the threads treated, to obtain indifferently, on the sameequipment and without modification to it, either classical texturedthreads or threads textured by friction.

The device for texturing by false twist according to the inventioncomprises at least one tube having a bar (or pin) mounted for turning intangential contact with two cylinders with parallel axes, turning in thesame direction, the turning tube being pressed against the cylinders bymagnetic means, and it is characterized in that in one part at least oneof the cylinders has a longitudinal conduit which has on the inside atleast one element of friction and that, in the other part, elements forthe return of the thread are arranged upstream and downstream of the twohollow cylinders.

Preferably, the two cylinders are hollow and comprise friction surfacesat their extremities, of a material with a high coefficient of friction,said surfaces being preferably curved.

Also, the elements for the return and guiding of the thread, placed upand downstream of each hollow cylinder, allow passing the thread eitherin the spindle, or tube, which allows to give it a classical falsetwist, or in at least one of the cylinders provided with frictionelements.

Preferably, as a return element, circular guides are used whose diameteris large and advantageously larger than 8 mm in order not to block thetwist given the thread by the friction elements.

In the case where one wishes to false twist by friction, the guidingmeans allow numerous combinations in the path of the thread.

In one form of embodiment, the false twist device according to theinvention comprises at least two return i more than two return guidesplaced up and downstream of each of the hollow cylinders so that thethread, during its treatment, passes in both hollow cylinders, thedirection of passage of the thread in the second hollow cylinder beingeither opposite or identical to the direction of passage of the threadin the first cylinder, the thread being placed in contact with all thefriction surfaces or only with certain of these surfaces.

Preferably, the position of at least one of the return guides isadjustable and the guides are advantageously off-center with respect toat least one of the longitudinal axes of the hollow cylinders.

These return guides allow operation in several different manners.

Thus, work is done in accumulation of twist until the thread is passedeither in a single hollow cylinder, or in both cylinders, the directionof passage of the thread in the second being the same as in the first,this mode of passage of the thread leading to very elastic threads, ofthe mousse type.

Also, less elastic threads can be obtained by passing the thread in bothhollow cylinders, the direction of passage of the thread in the secondhollow cylinder being opposite to that in the first hollow cylinder.

Finally it is evident that such a device can be used on any machine forfalse twist, whether fixed or not, and particularly on machines having athread cooling section after the setting oven, as described in FrenchPat. 1,583,799.

The present invention is better understood from the following example ofexecution, as well as from the accompanying drawings.

FIG. I shows schematically an overall view of a texturing loom equippedwith a device according to the invention.

FIG. 2 shows a schematic view of the device according to the invention.

FIG. 3, which is a variant of FIG. 1, shows an example in which the pathof the thread is modified and extended after the exit from theheat-setting oven.

FIGS. 4, 5 and 6 show various possibilities of execution of the deviceaccording to the invention, the twists given by the friction elementsbeing cumulative.

FIG. 7 shows an example in which the twist given by the first hollowcylinder is at least partially cancelled by that given in the secondhollow cylinder.

As can be seen in FIG. 1, which is a schematic view of a loom fortexturing by false twist, a thread 1 stocked on a spool 2 is unwound bya driven thread delivery device 3 and then passes in a heating box 4before being subjected to the action of a false twist device 5. It isthen drawn by a second thread delivery device 6 and finally rewound inthe form of a spool 7.

The execution and the operation of a false twist device 5, according tothe present invention, are illustrated by FIG. 2. As can be seen in FIG.2, this false twist device consists of a revolving spindle 8 mounted intangential contact with the two sets of disks 11, 12, I3 and 14integrally attached to the two cylinders 9 and 10 with parallel axes.The spindle 8 is pressed against disks ll, 12, 13, 14 by magnetic meansnot represented in the diagram. Also, the driving in rotation of theassembly is done by a belt 15 which drives cylinder 9 tangentially. Forthe sake of clarity this diagram does not show the bearings in which thehollow cylinders revolve.

Each of the two cylinders 9 and comprises a longitudinal conduit 16 and17, the friction elements 18, 19 and 20 and 21 being placed at theextremities of the two conduits l6 and 17. Also, return rollers 22, 23,24, 25, 26, 27 and 28 are placed upstream and downstream of the twohollow cylinders 9 and 10 and allow modifying the path of the thread inthe false twist device.

In a practical form of execution the length of the ho]- low cylinders isnear 100 mm and the inside diameter of the conduit is 3 mm, a funnelshaped friction element being placed at each extremity of the hollowcylinders.

The operation of this device is the following:

The belt drives in rotation cylinder 9 which communicates its movementof rotation to spindle 8 by means of rollers or disks 13 and 14, thespindle 8 in turn driving cylinder 10 by means of rollers or disks 1 1and 12. Consequently the two cylinders 9 and 10 turn in the samedirection.

As can be seen in FIG. 2, the thread at the exit from the oven 4 canpass either directly in the false twist spindle 8 before being rewound,the path being represented in long and short dashed lines 1a in thediagram or, by means of return elements 22 and/or 23 and/or 24 and/or 25and/or 26 and/or 27, the thread can pass inside conduits 16 and 17 ofthe hollow cylinders, and thus come to rub on the friction surfaces 21and/or and/or 19 and/or 18, one of the possible paths being representedin dashed lines lb.

FIG. 3 shows an example in which the path of the thread is modifiedafter the exit from the setting oven which allows, during high speedtreatments, to obtain a better cooling, a better distribution of thetwist, and consequently a thread having uniform properties along itsentire length.

Also, FIGS. 4, 5, 6 and 7 show various possibilities of paths for thethread. On these figures only the friction surfaces 18, 19, 20, and 21and the return elements have been shown schematically.

FIG. 4 shows a path with contact of the thread 1 on two frictionelements 20, 21 placed at both extremities of tube 9, the twist given bysurface 20 being of the same direction as that given by surface 21.

FIG. 5 shows a path with contact of the thread on three frictionsurfaces, the twist given by surface 18 being of the same direction asthose given by surfaces 20 and 21.

FIG. 6 shows a path with contact of the thread on four frictionsurfaces, the twists given by surfaces 18, 19, 20 and 21 being of likedirection.

FIG. 7 shows a path with contact of the thread on three frictionsurfaces 21, 20 and 18, the twists given by surfaces 20, 21 being ofopposite direction with respect to that given by surface 18.

As can be seen, the defice of the present invention allows treating athread in many different ways which allow obtaining threads havingdifferent aspects and EXAMPLE I In this example, illustrated by FIG. 4,a thread of polyhexamethylene adipamide 22 dtex/3 strands is subjectedto the action of two friction surfaces 21 and 20, the path of the threadbeing determined by the guiding elements 22 and 23.

The conditions of treatment are as follows:

Hardness of the friction surfaces shore Oven temperature 215 C Threadspeed 300 m/min Driving speed of tube 9 33,800 R.P.M.

The thread obtained is puffed and has an elasticity of 250 percent.

EXAMPLE 2 The previous example is repeated, but with the threadfollowing the path illustrated by FIG. 5, the thread being in contactwith the three friction elements 18, 20 and 21, and the path of thethread being determined by guiding elements 22, 25 and 28. The threadobtained has an elasticity of 321 percent.

EXAMPLE 3 In this example, illustrated by FIG. 7, a thread ofpolyhexamethylene adipamide 22 dtex/7 strands is subjected to the actionof the three friction surfaces 21, 20 and 18.

The conditions of treatment are as follows:

Hardness of the friction surfaces 70 shore Oven temperature 2l5 C Threadspeed 180 m/min Driving speed of tube 9 33,800 R.P.M.

In this case the twist communicated by surface 18 is opposite indirection to that communicated by surfaces 20 and 21 and the thread hasan elasticity of 256 percent, reduced with respect to example 2, inwhich the three friction surfaces give the thread twists of likedirection.

It must be noted that this lower elasticity is obtained despite a slowerpassage (I m/min instead of 300 m/min) of the thread in the treatmentdevice.

The examples given above illustrate various possibilities of use offalse twist by friction of the device according to the invention, but itis evident that this device can be used to perform classical falsetwist, the thread then passing in the spindle 8.

That which is claimed is:

1. A device for false twist texturing thread of thermoplastic materialcomprising at least one false twist tube having a cross-pin, a pair ofrotatable cylinder means having spaced parallel central axes, magneticmeans mounting said false twist tube for rotation in tangential contactwith said pair of cylinder means, at least one of said cylinder meanshaving a central longitudinal conduit for the passage of a thread,friction means positioned in said longitudinal conduit for peripheral engagement of a thread passing therethrough to impart twist thereto, andthread guide means positioned upstream and downstream of said cylindermeans for directing thread in a selected path to and from said falsetwist tube and said rotatable cylinder means.

2. A device as defined in claim 1 wherein each of said pair of cylindermeans has a conduit for the passage of thread therethrough, and saidfriction means comprises friction surfaces positioned at extremities ofeach of said conduits for engaging the thread.

3. A device as defined in claim 1 wherein said thread guide means have acircular, thread-engaging surface with a diameter greater than about8mm.

4. A device as defined in claim 1 wherein said thread guide meanscomprise at least two thread return guides, one of said thread returnguides positioned upstream and at least one other of said return guidespositioned downstream of the cylinder means.

5. A device as defined in claim 4 wherein each of said thread returnguides is off-center with respect to at least one of the axes of thethread conduits of said cylinder means.

6. A device as defined in claim 4 wherein all of said thread guide meansare positioned off-center with respect to the axes of said conduits ofsaid cylinder means.

7. Apparatus for false twisting a running yarn strand comprising a pairof rotatable cylinder means, at least one of said cylinder means havingan axially positioned thread passageway therethrough and friction meanspositioned in said passageway for engaging a strand passing therethroughto impart twist thereto during rotation of said cylinder means, spindlemeans including a tube having a cross-pin therein for engaging a strandpassing through said tube to twist the strand during rotation of saidtube, means rotatably mounting said spindle means in peripheralengagement with said cylinder means whereby rotation of said cylindermeans imparts rotation to said spindle means, and strand guide meanspositioned adjacent said cylinder means and spindle means for directinga strand in selected paths through said cylinder means and/or spindlemeans.

8. Apparatus as defined in claim 7 wherein the other of said cylindermeans includes an axially positioned passageway for a strandtherethrough, and friction means for engaging and twisting a strandpositioned in said passageway during rotation of said cylinder means.

9. Apparatus as defined in claim 7 wherein said cylinder means includesa pair of hollow cylinders positioned with their central axes inparallel spaced relation, and means extending radially outwardly fromthe surface of each of said cylinders and engaging said spindle means tosupportably position it for rotation therewith, the central axis of saidtube of said spindle means being generally parallel to the central axesof said cylinders, and means for driving one of said cylinders to impartrotation to said tube and other cylinder.

1. A device for false twist texturing thread of thermoplastic materialcomprising at least one false twist tube having a crosspin, a pair ofrotatable cylinder means having spaced parallel central axes, magneticmeans mounting said false twist tube for rotation in tangential contactwith said pair of cylinder means, at least one of said cylinder meanshaving a central longitudinal conduit for the passage of a thread,friction means positioned in said longitudinal conduit for peripheralengagement of a thread passing therethrough to impart twist thereto, andthread guide means positioned upstream and downstream of said cylindermeans for directing thread in a selected path to and from said falsetwist tube and said rotatable cylinder means.
 2. A device as defined inclaim 1 wherein each of said pair of cylinder means has a conduit forthe passage of thread therethrough, and said friction means comprisesfriction surfaces positioned at extremities of each of said conduits forengaging the thread.
 3. A device as defined in claim 1 wherein saidthread guide means have a circular, thread-engaging surface with adiameter greater than about 8mm.
 4. A device as defined in claim 1wherein said thread guide means comprise at least two thread returnguides, one of said thread return guides positioned upstream and atleast one other of said return guides positioned downstream of thecylinder means.
 5. A device as defined in claim 4 wherein each of saidthread return guides is off-center with respect to at least one of theaxes of the thread conduits of said cylinder means.
 6. A device asdefined in claim 4 wherein all of said thread guide means are positionedoff-center with respect to the axes of said conduits of said cylindermeans.
 7. Apparatus for false twisting a running yarn strand comprisinga pair of rotatable cylinder means, at least one of said cylinder meanshaving an axially positioned thread passageway therethrough and frictionmeans positioned in said passageway for engaging a strand passingtherethrough to impart twist thereto during rotation of said cylindermeans, spindle means including a tube having a cross-pin therein forengaging a strand passing through said tube to twist the strand duringrotation of said tube, means rotatably mounting said spindle means inperipheral engagement with said cylinder means whereby rotation of saidcylinder means imparts rotation to said spindle means, and strand guidemeans positioned adjacent said cylinder means and spindle means fordirecting a strand in selected paths through said cylinder means and/orspindle means.
 8. ApparatUs as defined in claim 7 wherein the other ofsaid cylinder means includes an axially positioned passageway for astrand therethrough, and friction means for engaging and twisting astrand positioned in said passageway during rotation of said cylindermeans.
 9. Apparatus as defined in claim 7 wherein said cylinder meansincludes a pair of hollow cylinders positioned with their central axesin parallel spaced relation, and means extending radially outwardly fromthe surface of each of said cylinders and engaging said spindle means tosupportably position it for rotation therewith, the central axis of saidtube of said spindle means being generally parallel to the central axesof said cylinders, and means for driving one of said cylinders to impartrotation to said tube and other cylinder.